Any overhead valve V engine is subject to sealing, or not sealing, in the same manner.

I haven't thought much about how to detect gasket gaps at the head/manifold interface. What if you introduced a thick smoke into the crankcase through the oil dipstick tube and cycled the motor over slowly by hand with a socket on the crank bolt? Seems that if you took all the spark plugs out, the cylinder(s) that is (are) oiling would emit smoke from the spark plug holes. Yes? No?

I'll bet the majority of motors out there are not sealed up like they should be because it isn't something that we have been paying attention to.

That sounds like it might make sense. I guess I will bring it to work Monday, we do have a smoke machine there.
Was hoping it was just valve seals lol.
Thanks for the input Richard